Improper access control in Open WebUI - CVE-2026-45386
Published: May 11, 2026
Vulnerability identifier: #VU130953
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-45386
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to modify message pin status.
The vulnerability exists due to improper access control in the pin_channel_message API endpoint when handling pin and unpin requests for standard channels. A remote user can send a crafted request to modify message pin status.
In standard channels, the endpoint checks read permission instead of write permission, allowing users with read-only access to pin or unpin messages.
Affected software
Open WebUI
How to mitigate CVE-2026-45386
Install security update from vendor's website.
Open WebUI - update to 0.9.5